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Public proof of conceptFix available

CVE-2021-25094

A public proof of concept exists; no exploitation attested.

  • Published2022-04-25
  • Fixed in3.3.12
  • WeaknessCWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The Tatsu WordPress plugin before 3.3.12 add_custom_font action can be used without prior authentication to upload a rogue zip file which is uncompressed under the WordPress's upload directory. By adding a PHP shell with a filename starting with a dot ".", this can bypass extension control implemented in the plugin. Moreover, there is a race condition in the zip extraction process which makes the shell file live long enough on the filesystem to be callable by an attacker.

Timeline

dates in UTC
  1. 2022-04-2516:16CVE publishedNVD
  2. 2025-04-18Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-25094?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-25094?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Brandexponents tatsu
BranchAffectedFixed in
3.3< 3.3.123.3.12

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Brandexponents tatsu to 3.3.12

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-52260
Exploit-DB
Proof-of-concept repositories
4 repositories, unverifieddarkpills/CVE-2021-25094-tatsu-preauth-rceTUANB4DUT/typehub-exploiterxdx57/CVE-2021-25094experimentalcrow1/TypeHub-Exploiter
PoC-in-GitHub
Metasploit modules
1 moduleexploit/multi/http/wp_tatsu_rcerank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2022-04-25
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-grmv-gp4f-w59q

Frequently asked questions

What is CVE-2021-25094?

The Tatsu WordPress plugin before 3.3.12 add_custom_font action can be used without prior authentication to upload a rogue zip file which is uncompressed under the WordPress's upload directory. By adding a PHP shell with a filename starting with a dot ".", this can bypass extension control implemented in the plugin. Moreover, there is a race condition in the zip extraction process which makes the shell file live long enough on the filesystem to be callable by an attacker.

Is CVE-2021-25094 actively exploited?

Active exploitation of CVE-2021-25094 has not been confirmed. Its EPSS score was 83.2% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-25094?

CVE-2021-25094 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record